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MathGroup Archive 2005

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Re:Re: Set of strings reducing problem (Again!)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg60404] Re:[mg60348] Re: Set of strings reducing problem (Again!)
  • From: "Edson Ferreira" <edsferr at uol.com.br>
  • Date: Thu, 15 Sep 2005 05:16:24 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Valeri,

I have tested both your modified code and the original one, and I saw no 
difference in performance as I wished to see. Making Dispatch table order
 independent made no effect.

The results, as expected, are the same!

Test1

Your code: 117,939 seconds
Original code: 116,928 seconds

Test 2

Your code: 29,542 seconds
Original code: 29,582 seconds

Does any math guru know how to improve the performance of this code?

Thanks!!!!!!


> Edson, 
> This is what I modified : 
> 
> -1- Make Dispatch table order independant 
> -2- Insert z___List between p and q for not neighbor cases 
> 
> 
> In[1]:= 
> Unprotect[D]; 
> U={"2","X"}; 
> M={"1","2"}; 
> D={"1","X"}; 
> T={"1","2","X"}; 
> L=Flatten[Outer[StringJoin,T,T,T,D]]; 
> L = Select[L, Count[Characters[#], "1"] > 1 &]; 
> cl = Characters /@ L; 
> r = Dispatch[{"1" + "X" -> "D", 
> "1" + "2" -> "M", 
> "1" + "U" -> "T", 
> "X" + "2" -> "U", 
> "X" + "M" -> "T", 
> "2" + "D" -> "T", 
> "X" + "1" -> "D", 
> "2" + "1" -> "M", 
> "U" + "1" -> "T", 
> "2" + "X" -> "U", 
> "M" + "X" -> "T", 
> "D" + "2" -> "T"}]; 
> ncl = StringJoin @@@ ( 
> cl //. {x___List, 
> {a___, p_String, c___}, 
> z___List, 
> {a___, q_String, c___}, 
> y___List} :> 
> {x, {a, p + q /. r, c}, z, 
> y} /; StringQ[p + q /. 
> r]) 
> Out[10]= 
> {11TD,1U1D,1UU1,U11D,U1U1,UU11} 
> 
> Seems to work... 
> 
> v.a. 
> 
> 



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